| 摘要 |
PURPOSE:To aim at the prevention of any drop in luminous brightness in a light emitting layer and the prolongation of its service life by coating the silica ceramic coating film made up of metal alkoxide as the chief ingredient onto a phosphor grain. CONSTITUTION:A light emitting layer 3 is formed by dispersing and including the phosphor grain 10 coated with a waterproof and moisture resistant film 9 in an organic dielectric 8. As for the waterproof and moisture resistant film 9, a silica ceramic, for example, making alkoxide a chief ingredient, is used. Since a process, in which the ceramic is coated on the phosphor grain 10, is carried out at low temperature, any deterioration in a phosphor due to heat will not occur at all, thus the phosphor grain 10 is protected from water and moisture. Consequently, luminous brightness will not go down for hours.
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